Manufacture of knives for nail-machines



(No Model.) v L. B. ROCKWELL.

MANUFACTURE OF KNIVES FOR. NAIL MAOHINES..

No. 393,858. v Patented Dec. 4, 1888.

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UNITED STATES PATENT OFFICE.

LUDLEM BASSETT ROCKWELL,- OF SUNBURY, PENNSYLVANIA.

MANUFACTURE OF KNIVES FOR NAIL-MACHINES.

SPECIFICATION forming part of Letters Patent No. 393,858, dated December4, 1888.

Application filed June 19, 1888. Serial No. 277,526. (No model.)

7 T0 aZZ whom it may concern.-

Be it known that I, LUDLEM BASSETT ROCK- WELL, a citizen of the UnitedStates, residing at Sunbury, in the county of Northumberlaud and Stateof Pennsylvania, have invented a new and useful Improvement in Knivesfor Nail-Making Machines, of which the following is a specification.

My invention relates to an improvement in knives for nail-makingmachines and in chills for casting the said knives; and it consists,first, in a knife made of chilled cast-steel; secondly, in a chill madeof iron and adapted for forming a knife for nail-cutting machines; andmy invention further consists in the peculiar construction andarrangement of devices, that will be more fully set forth hereinafter,and particularly pointed out in the claim.

In the accompanying drawings, Figure 1 is a perspective view of achilled knife embodying my improvements. Fig. 2 is a similar View of myimproved chill for casting the knife. Fig. 3 is a transverse sectionalview of the same.

Heretofore it has been the practice to make the knives for nail-cuttingmachines by forging the same from Mushet steel. Knives thus manufacturedrequire regrinding when used shall be much more durable and efficientthan the knives heretofore constructed.

To this end I provide a chill, A, which is made of iron and which has aninterior opening or mold, B, which corresponds in size and shape withthe knife to be fashioned. The scraps of Mushet steel are melted andpoured into the chill, and thereby a knife, C, is produced at a veryslight cost which. is much more durable and efficient than the knivesheretofore made.

I have found that in practical operation my improved chilled knives thusconstructed will out cold nails continuously in a nail-machine for sixhours before it is necessary to regrind the knife, and will cut hotnails fifteen hours with one sharpening. 1

I do not desire to limit myself to the use of Mushet steel inmanufacturing my knives, as the same maybe made of other suitable kindsof forged steel, if preferred.

The chill A has a removable face-plate, D,

which is secured to the body of the chill by means of clamps or bolts E.

Having described my invention, I claim The method of making knives fornailcutting machines, consisting in forging Mushet steel andsubsequently melting the sameand pouring it into a chill-mold having anopening or mold of the requisite form.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

LUDLEM BASSETT ROCK\VELL.

\Vitnesses:

M. C. BowLBY, JOHN P. MCCABE.

